qnap-utils

Utilities to unpack QNAP firmware images and QPKG files

extract_qnap_fw.sh

This script unpacks a firmware image. The firmware image can be passed in the original form (*.img), decrypted (*.tgz), or as a source directory.

Usage:

./extract_qnap_fw.sh firmware.img destdir
./extract_qnap_fw.sh firmware.img.tgz destdir
./extract_qnap_fw.sh srcdir destdir

this results in:

destdir/fw              files extracted from the firmware.img
destdir/sysroot         unpacked initrd/initramfs, rootfs2, rootfs_ext
destdir/qpkg            unpacked qpkg.tar

extract_qpkg.sh

This script unpacks a QPKG file.

Usage:

./extract_qpkg.sh package.qpkg [destdir]

Another way to do this would be using the QDK tool.

what is different compared to the original max-boehm tools?

The max-boehm script does not work on macOS for two reasons:

Reason 1:

SKIP=`wc -c < $DEST/header_script`

On macOS, wc -c has a leading tab. The solution would be:

SKIP=$(sed -n 's/script_len=\(.*\)/\1/p' $DEST/header_script)

Reason 2:

od -t x1 -w4 -Ad -v $DEST/payload | grep '1f 8b 08 00' | awk '{print $1}'

The macOS version of od does not support the parameter -w (--width). A solution would be:

printf "%d\n" $(hexdump -C $DEST/payload | grep '1f 8b 08 00' | awk '{print "0x"$1}')

hexdump displays the position of the grep'ped string in hex.
'print "0x"$1' will output the position with a leading '0x'
'printf "%d"' will convert a hexadecimal to decimal number

The extract.qpkg script has been amended.